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Библиотека СОК
Litho U.S.A.
2003
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice must be performed by a qualified installer, ser-
vice agency or the gas supplier
Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Support
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct Connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging Unit For Lifting
Condensate Drains
Gas Piping
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LGA/LCA/LGC/LCC248, 300 & 360 Parts Arrangement
Note: LGA shown; LCA will have electric heat in the same
location as gas heat.
ECONOMIZER
DAMPERS (OPTIONAL)
BLOWERS
BLOWER MOTOR
CONTROL BOX
CONDENSATE
DRAIN
115V GFCI OUTLET
(Factory−installed option)
DISCONNECT
(Factory−installed option)
EXCHANGER TUBES
10/03
*2P1003*
. . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FILTERS
(TWELVE − 20 X 20 X 2")
HEAT
INSTALLATION
INSTRUCTIONS
LGA/LCA248H
LGC/LCC300H
LGA/LCA360H
L SERIES PACKAGED UNITS
504,819M
10/2003
Supersedes 9/2003
Table Of Contents
1
Pressure Test Gas PIping
2
Factory−Installed Options
2
Electrical Connections
2
Blower Operation and Adjustments
2
Cooling Start−Up
3
Gas Heat Start−Up
3
Heating Operation and Adjustments
4
Electric Heat Start−Up
4
Service
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATOR
COIL
BURNERS
COMBUSTION AIR
INDUCER
(21 TON)
(25 TON)
(30 TON)
. . . . . . . . . . . . . . . . . . . . . . . . .
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CONDENSER FANS
(6)
CONDENSER
COILS
COMPRESSORS
(4 COMPRESSORS ON
248 & 300H UNITS)
504,819M
*P504819M*
5
5
7
8
11
16
17
18
18
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Related Manuals for Lennox LCA248H
Summary of Contents for Lennox LCA248H
- Page 1 Библиотека СОК INSTALLATION INSTRUCTIONS Litho U.S.A. 2003 RETAIN THESE INSTRUCTIONS LGA/LCA248H FOR FUTURE REFERENCE (21 TON) LGC/LCC300H (25 TON) WARNING LGA/LCA360H (30 TON) Improper installation, adjustment, alteration, ser- vice or maintenance can cause property damage, L SERIES PACKAGED UNITS personal injury or loss of life.
- Page 2 LGA/LCA/LGC/LCC248, 300 & 360 Dimensions − LGA Heat Section Shown Note: Optional equipment shown for information only. See Engineering Handbook for standard and optional features. CONDENSER COIL INTAKE OPTIONAL OUTDOOR AIR HOOD (Factory or Field Installed) 4-1/4 (108) OPTIONAL 78-1/2 (1994) ECONOMIZER DAMPERS 15 (381) 5-3/4...
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Page 3: Service Clearances
1992. Approved methods of recovery, recycling or LCA/LCC units. LGA/LGC and LCA/LCC units have reclaiming must be followed. Fines and/or incar- identical refrigerant circuits with respective 21, 25, and ceration may be levied for non−compliance. cooling capacities. LGA/LCA248H LGC/LCC300H units contain four compressors; CAUTION LGA/LCA360H units contain three compressors. -
Page 4: Rigging Unit For Lifting
Unit Support − Continued CAUTION Installer’s Roof Mounting Frame In downflow applications, do not drill or punch holes in base of unit. Leaking in roof may occur if Many types of roof frames can be used to install the unit unit base is punctured. -
Page 5: Condensate Drain Connection
Condensate Drains OUTSIDE OF UNIT GAS PIPE CONNECTION Make drain connection to the 1" N.P.T. drain coupling TO GAS provided on unit. A trap must be installed between drain GROUND VALVE connection and an open vent for proper condensate JOINT UNION removal. -
Page 6: High Altitude Derate
Pressure Test Gas Piping (Gas Units) High Altitude Derate Natural gas units may be installed at altitudes up to 2000 When pressure testing gas lines, the gas valve must feet (610m) above sea level without any modification. At be disconnected and isolated. Gas valves can be altitudes above 2000 feet (610 m), units must be derated damaged if subjected to more than 0.5 psig (3.5kPa). - Page 7 INTAKE HOOD CAULK EACH END (FIELD INSTALLED) UNIT TOP SEAL HOOD STIFFENER HOOD TOP HOOD TOP HOOD SIDE SIDE FILTER BRACKETS SHORTER TOP FILTER BRACK- LONGER TOP FILTER BRACKET FIGURE 8 HOOD SIDE VIEW HOOD TOP SEAL HOOD STIFFENER HOOD TOP FILTER TOP FILTER BRACKET...
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Page 8: Electrical Connections
B−Control Wiring Electrical Connections 1− Route thermostat cable or wires from subbase POWER SUPPLY through knockout provided in unit. Use18 AWG wire applications using remotely installed Do not apply power or close disconnect switch until electro−mechanical and electronic thermostats. installation is complete. Refer to start−up directions. 2−... -
Page 9: Blower Assembly
C−Determining Unit CFM Blower Operation and Adjustments 1− The following measurements must be made with a IMPORTANT dry indoor coil. Run blower without a cooling demand. Measure the indoor blower shaft RPM. Air filters must Three phase scroll compressors must be phased be in place when measurements are taken. - Page 10 TABLE 3 FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE BLOWER TABLE INCLUDES RESISTANCE FOR BASE UNIT ONLY WITH DRY INDOOR COIL & AIR FILTERS IN PLACE. FOR ALL UNITS ADD: 1 − Wet indoor coil air resistance of selected unit. 2 −...
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Page 11: Pulley Alignment
TABLE 4 FACTORY INSTALLED OPTIONS/FIELD INSTALLED ACCESSORY AIR RESISTANCE Total Resistance inches water gauge (Pa) Air Volume Air Volume Air Volume Electric Electric Electric Horizontal Horizontal Horizontal Gas Heat E changer Gas Heat Exchanger Gas Heat Exchanger W t I d Wet Indoor Wet Indoor Heat... - Page 12 2− Apply perpendicular force to center of span (X) with Cooling Start−Up enough pressure to deflect belt 1/64" for every inch of IMPORTANT−The crankcase heater must be energized for span length or 1.5mm per 100mm of span length. 24 hours before attempting to start compressor. Set Example: Deflection distance of a 40"...
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Page 13: Evaporator Coil
A−Preliminary Checks 360H − Units contain three refrigerant circuits or systems. 1− Make sure that unit is installed in accordance with the Evaporator and condenser coil refrigerant circuits 1 installation instructions and applicable codes. and 2 make up stage 1 cooling. Evaporator and condenser coil refrigerant circuit 3 makes up stage 2 2−... - Page 14 360H REFRIGERANT CIRCUITS STAGE 1 (30 TON) CONDENSER COILS EVAPORATOR COIL STAGE 2 EVAPORATOR COIL STAGE 1 EVAPORATOR COIL STAGE 2 CONDENSER COILS FIGURE 15 NOTE − System charging is not recommended below Cooling Start−Up − Continued 60_F (15_C). In temperatures below 60_F (15_C) , the D−R410A Refrigerant charge must be weighed into the system.
- Page 15 7− Use the following approach method along with the 95_F normal operating pressures to confirm readings. 105_F TABLE 8 115_F LGA/LCA248H − R22 *Outdoor fans may cycle on and off at this temperature. CIRCUIT 1 CIRCUIT 2 CIRCUIT 3 CIRCUIT 4 Outdoor Outdoor TABLE 12...
- Page 16 G−Compressor Controls 248 & 300H Condenser fans 1, 2, and 3 are energized on a Y1 See unit wiring diagram to determine which controls are cooling demand; condenser fans 4, 5, and 6 are used on each unit. energized on a Y2 cooling demand. Condenser fans 1−...
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Page 17: For Your Safety Read Before Lighting
This unit is equipped with an automatic spark ignition Gas Heat Start−Up (Gas Units) system. There is no pilot. In case of a safety shutdown, FOR YOUR SAFETY READ BEFORE LIGHTING move thermostat switch to OFF and return the thermostat switch to HEAT to reset ignition control. - Page 18 6− Wait five minutes to clear out any gas. If you then 6− For troubleshooting purposes, an ignition attempt smell gas, STOP! Immediately call your after lock out may be re−established manually. Move gas supplier from a neighbor’s phone. Follow the gas thermostat to OFF"...
- Page 19 3− Remove the right burner and check the alignment of CAUTION the ignition sensor. See figure 21. Label all wires prior to disconnection when servic- 4− Replace burners and burner support cap. Secure cap ing controls. Wiring errors can cause improper and in place with retained screws.
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Page 20: Heat Exchanger Assembly
C−Burners (Gas Units) HEAT EXCHANGER ASSEMBLY 1− Periodically examine burner flames for proper HEAT EXCHANGER appearance during the heating season. COMBUSTION TUBE 2− Before each heating season examine the burners for AIR INDUCER any deposits or blockage which may have occurred. 3−...
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